80=2r+6r

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Solution for 80=2r+6r equation: 



80=2r+6r

We move all terms to the left:

80-(2r+6r)=0

We add all the numbers together, and all the variables

-(+8r)+80=0

We get rid of parentheses

-8r+80=0

We move all terms containing r to the left, all other terms to the right

-8r=-80

r=-80/-8

r=+10

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